Clinical Trials in Psoriasis

Transcription

1 Clinical Trials in Psoriasis A positive approach to psoriasis and psoriatic arthritis

2 Introduction When you go to the pharmacy to collect the treatment your doctor has prescribed, have you ever wondered how that treatment has been developed and how its efficacy has been proven? This booklet will take you on a journey on the life of a medicinal product and will also explain in detail the concept of clinical trials so that you are better informed on your rights and can make an informed decision when asked to participate. The process of drug development is long. Did you know that most of the medicines that you buy from your pharmacist have undergone a year testing period before they could be prescribed and sold! This may help explain why some treatments are so expensive! When a new treatment is discovered, it is usually in the form of a chemical molecule. This molecule will initially be tested using standard laboratory tests for its effects on say inflammation or skin differentiation. If the results from these initial tests are promising the process of drug development will be initiated. Drug development may involve a number of things such as the technical aspects of a chemical scale up, analytical analysis of the material and pharmaceutical development of a dosage form and formulation. Development also refers to the entire process of taking a newly discovered compound through regulatory approval and to the point of marketing. One of the most important decisions that a company makes, is which of its novel molecules it will develop into a medical treatment. Only 1 in 10,000 molecules makes it to the market! Therefore this is indeed a key decision which is made according to established criteria, specific for each company. When a chemical compound is found that meets these criteria then it is developed as a medicine. The compound will continue to be developed until events demonstrate that some of the criteria (especially that of safety and efficacy) cannot be met and that it is no longer likely or possible to achieve a medically and commercially viable medicine. As a psoriasis sufferer you may be accustomed to using creams as opposed to tablets. These creams however, go through the same rigorous process of analysis and evaluation as an oral treatment. One must understand that a drug, be it topical or oral is a medication and will therefore have undergone all the controls and tests required by the law. People that think 2

3 topically applied treatments are weak medications are wrong. Topical treatments are preferred in dermatology because these will act directly on the diseased organ:- ie the skin. The development plan The development plan refers to the development of a molecule into a medical treatment. The first phase of the development plan includes pharmacology and toxicology studies that are primarily carried out in animals. In these preliminary studies the therapeutic action is evaluated in terms of active dose, toxicity and side effects. Parallel with this, the formulation department will work on incorporating the active molecule into different types of creams and gels that will eventually be applied onto the skin. Once researchers are satisfied with the results from these initial stages will the clinical trials on humans commence. The aim of these clinical trials is to register the new treatment with the Medicines Control Agency (MCA). Therefore a number of studies will be carried out, following the different phases outlined below, in order to collect information for the submission of the new drugs dossier. Thus, this is a highly controlled process in which registration will only take place if the data is sufficient, accurate and thereby acceptable by the MCA. Indeed, clinical trials have to be rigorously planned and carried out in order to ensure the utmost amount of safety for the subject trying out the molecule and the utmost amount of accuracy in testing the effects of the new treatment. Planning a clinical trial? There are certain parties involved in the planning of a clinical trial. Usually a pharmaceutical company will have a new drug to register and will therefore have a corresponding development plan to carry out. This development plan will include numerous clinical trials in order to prove the efficacy and safety of this new treatment on human subjects. Specialists from the company will be responsible for the design of the trials and for choosing an investigator (a dermatologist) for carrying out each trial. The design of these trials will correspond to the objectives for each particular study. These objectives in turn will correspond to the major and minor questions that the study is designed to answer. In all types of studies the objective should be stated as specifically as possible in the protocol. The protocol is the bible of clinical trials since it contains an accurate and complete 3

4 description of the methodology of the trial, evaluations to be made during the trial, general information on the personnel involved in the trial and indeed all the reglementary sections. > Methodology of the trial The protocol will contain an accurate and complete description of the study methodology. This will include : Name and description of the new treatment. Summary of findings of other studies already carried out. When and how the patient should apply the treatment. Description of the population to be studied. An accurate description of trial design including the measures taken to avoid bias. The expected duration of participation. A description of the stopping rules. > Evaluations Methods, timing and specification of the efficacy and safety parameters. Procedure for eliciting reports and reporting any side effects and inter current illnesses. Description of the statistical procedures to be used in analysing the data obtained during the trial. > General information Name and address of the pharmaceutical company who is carrying out the trial. Name and address of the investigator carrying out the trial. Name, address and telephone number of everybody involved in the conception, design and carrying out of the clinical trial. > Reglementary section Financing and insurance of the study. Data handling and record keeping procedures. Description of the ethical considerations relating to the trial. Description of quality control and quality assurance to be adopted during the trial. 4

5 This protocol will then be submitted to the local ethics committee an independent group of people, appointed by the local health authority, which includes doctors, nurses, medical staff, lawyers and members of the public. They will decide whether the trial is ethical. In particular they check that: The researchers are qualified to carry out the trial. The protocol is suitable for the needs of the trial. The probable benefits of a new treatment outweigh the side effects. There is enough information for participants. The way in which people will be recruited is correct. The local health facilities can support the trial. Once the protocol has been approved by the ethics committee, the study can commence. Clinical trials explained The purpose and objectives of a study are usually related to some degree with the phase of clinical testing the study drug is in. There are four phases of clinical testing: Phase one: This is the initial administration in healthy human subjects. Healthy subjects are chosen for this phase since it is easier to control an unexpected adverse reaction. The main objective at this stage is to verify the dosage of treatment which is well tolerated. Hence these studies require extreme precaution and care and will be closely monitored by both doctors and research personnel. Safety evaluations are the primary and almost always the sole objectives. The doses administered are chosen after careful analysis of the results obtained in animals. Usually very small doses are used, these are then increased accordingly. Phase two: These are the studies designed to evaluate efficacy in selected populations of patients for whom the drug is intended. These studies are rigorous and well controlled and are carried out in a small population of patients with similar disease characteristics. By the time the treatment reaches phase two, researchers will know quite a lot about it since only those treatments which look 5

6 promising in phase one will progress to phase two. Phase one will have shown what the major side effects are and whether they are acceptable in relation to any potential benefit. Phase three: These studies are conducted in patient populations for which the drug is eventually intended. These studies generate additional data on both safety and efficacy on much larger and more heterogenous groups of patients than phase two studies. Often the studies entail a comparison between the new product and a treatment already available in the shops. These studies provide much of the information that is needed for the package insert and labelling of the drug. If you are asked to take part in a phase two or phase three study there are a number of terms which you may hear: Most of these trials will be randomised. This means that a computer will randomly allocate patients to one or other of the treatment groups in the trial. This is done so that each group has a non biased mix of patients of different ages and sex. If it were left to the researchers to decide who should get which treatment they might be influenced by what they know about their patients. Consciously or unconsciously they might put patients who were more or less likely to respond to a new treatment into that group. This would introduce bias, making the results unreliable. Randomised trials are by definition, controlled. A control is something with which to compare the treatment being tested. Usually the control will be the standard treatment or a placebo (dummy treatment). Without a control it is impossible to measure how much would have happened by chance or with the standard treatment. If you take part in a trial of a new treatment, you may not be told which treatment group you are in. This is called a blind trial. The medicine that all the patients are given will look the same whether it is the new treatment, standard treatment, or placebo. Some trials are double blind which means that neither you nor the doctor treating you knows which treatment you are getting. Your doctor opens a specially coded treatment pack and only the trial organisers know which particular drug it contains. Making a trial blind or double blind is again aimed at reducing bias. If you knew which treatment you were getting it might influence how you felt. For example, knowing you were taking a 6

7 new treatment might make you feel more positive or more negative, and therefore influence what you report to the researchers. Similarly, if the researchers knew you were taking a new treatment for which they had high hopes, this might affect how they judged your response to it. Phase four: This phase commences after a drug has been marketed and is commercially available. These studies are used to provide additional details required to learn more about the drug s efficacy and/or safety profile. Bearing all this in mind, it is important to be aware that before any clinical study is undertaken, careful consideration is given to the question of why the study has been proposed. Reasons for performing a study are carefully evaluated from the point of view of whether the study is truly necessary to answer the questions posed. Clincal trials in psoriasis Depending on the type of trial any of the following evaluations may be carried out on lesions: Erythema (redness): The investigator will assess the extent of redness on the treated areas. Dryness: This is defined as tight sensations on the treated area due to the unusual dryness of the skin. The dermatologist will feel the treated area himself and will also ask you if you have experienced sensations of this sort during the treatment period. Desquamation: desquamation is the abnormal shedding or peeling of the skin. The dermatologist will evaluate this parameter by looking closely at the treated area. Burning: The dermatologist will ask you if you have experienced any prickling pain sensations at any time during the course of treatment in order to evaluate burning. Pruritus: The dermatologist will ask you if you have experienced any itching sensations in order to evaluate this parameter. 7

8 Infiltration: This is a simple evaluation in which the hardness or firmness of the tissue around the site of the lesion will be assessed. As you can appreciate, all the different visual characteristics of the lesions are investigated and examined in order to assess the efficacy and safety features of the new treatment. In addition to these visual factors some clinical trials also include questionnaires about the quality of life and psychological factors. These are dealt with in the following chapter. Quality of life questionnaires? Over the last few years, researchers have developed detailed tests and questionnaires which allow them to measure the quality of life. These allow them not only to look at the effect of a new treatment on your psoriasis but also at its much wider effects on your life as a whole, and to compare these effects with those of other forms of treatment. Some of the questions you are asked during a trial may seem rather unnecessary and quite unrelated to your treatment. For example you may be asked questions such as: Over the last few weeks, how much has your skin influenced the clothes you wear? Over the last few weeks, how embarrassed or self conscious have you been because of your skin? Over the last few weeks, has your skin prevented you from working or studying? There is a good reason why you are asked such questions. The aim of any medical treatment isn t just to help you get well again. It is also geared to improving your day to day living i.e. your quality of life. Who is in charge of the clinical trial? The dermatologist who asks you to take part in a clinical trial may not be the person who designed and set up the trial. However he/she should have been fully informed about the study before agreeing to become involved and should have all the information you need. 8

9 Who can participate in clinical trials? This depends entirely on the type of clinical trial being carried out. Each trial has certain criteria which people must adhere to in order to participate. Since clinical trials investigate the effects of new treatments, it is important not to confuse these effects with that of other treatments. Therefore, one of the most common criterion is that if you wish to participate you might have to stop your current treatment for a specified period of time. Therefore depending on your own personal characteristics, you might have a clinical trial for which you are eligible but then again there might be another trial for which you are not. How can I find out more about clinical trials? The saying goes, where there is a will there is a way. This is also true for clinical trials participation is easy if you want to participate. Your dermatologist is probably the best source of information since he/she will be most certainly implicated in clinical trials of some sort. Risks and benefits? There are both risks and benefits to consider when participating in a clinical trial. When you take part in a trial you will be monitored carefully during and after the study. You will have regular evaluations and will sometimes be asked questions about how you are feeling in general. This might mean that you will go to the hospital more regularly than usual, so you should bear this in mind when agreeing to participate. Taking part in a clinical trial does not guarantee you better treatment, nor will you automatically get the treatment being tested. However your psoriasis will be closely monitored by a dermatologist during the clinical trial and therefore any changes, for better or for worse will be quickly picked up and acted upon. No one should ever include you in a clinical trial without asking you. Any doctor, nurse or other researcher should always ask your permission and, if you do not give your consent, they cannot enter you into the trial. 9

10 You will however, be helping to improve our understanding of psoriasis and the best way to treat it. This does not mean that you are obliged to take part. You should only agree to help with a trial if you are entirely happy with what you are being asked to do. It is important to be aware that you can pull out at any time if you change your mind. By reading and understanding more about clinical trials now, with time to think about all the issues, we hope you will feel happier and more confident in your decision, whether or not you agree to take part. To help you decide whether you want to take part, the researchers should tell you all about the study what it is trying to find out, how you will be treated and what you will have to do. Various guidelines have been drawn up for the researchers about the sort of information that people need in order to decide whether to take part in a clinical trial. But there is a lot of debate about how much people really want to know and, of course in practice this varies from person to person. The important thing is that you are satisfied you have enough information to make an informed decision. You should feel free to ask any questions which you believe are important in helping you to reach a decision. You should also feel satisfied that you have been given enough time to think about the trial and what it will mean to you before you decide. The person who suggests that you take part in the trial should first discuss it with you and answer your immediate questions. He/she will not be able to give you a copy of the protocol since this is a scientific document containing confidential information. However, he or she should give you a leaflet or fact sheet about the trial which you can take away and read at your leisure if you wish. If you wish to take part in the trial, you will be asked to give your written consent. However, remember that even after you have given your consent you are free to withdraw at any time. It will not affect your overall care and your doctor will not hold it against you. 10

11 Questions to ask before taking part What is the point of the trial and how will it help people? You should feel satisfied that the trial is worthwhile and that it is asking a useful question. How long will the study last? This very much depends on the type of the trial but could be anything from a couple of days to a number of months. Therefore if you have a holiday planned bang in the middle of a clinical trial it would be advisable not to participate! Can I withdraw at any time? The answer here must be YES Here is a selection of practical questions you may want to ask, to which there are no right or wrong answers. You just need to be sure that YOU are happy with the demands which the trial will make on you. How much of my time will be needed? Will I need to take time off work? Does the research budget cover the cost of my fares to and from the trial centre? What are the possible side effects of the treatment? Who can I contact if I have a problem? Will someone be available 24 hours a day? Always consult your doctor or healthcare provider. This material was produced by PAPAA. Please be aware that treatments and research is ongoing. For the latest and up to date information or any amendments to this material please contact us or visit our website. First published 2008 PAPAA Reviewed and revised May

12 The Charity for People with psoriasis and psoriatic arthritis PAPAA, the single identity of the Psoriatic Arthropathy Alliance and the Psoriasis Support Trust. The organisation is independently funded and is a principal source of information and educational material for people with psoriasis and psoriatic arthritis in the UK. PAPAA supports both patients and professionals by providing material that can be trusted (evidence based), which has been approved and contains no bias or agendas. PAPAA provides positive advice that enables people to be involved as they move through their healthcare journey in an informed way, which is appropriate for their needs and any changing circumstances. Contact: PAPAA PO Box 111 St Albans Herts AL2 3JQ Tel: Fax: info@papaa.org ISBN CT/05/10 Psoriasis and Psoriatic Arthritis Alliance is a company limited by guarantee registered in England and Wales No Registered Charity No Registered office: Acre House, William Road, London, NW1 3ER